When uploading files without using the form helper form.file_field, you have to add the option multipart: true to the form tag.
Discovered in API Docs
< %= form_with(model: @company), multipart: true) do |form| %> -- When using: -- <input type="file" name="company[logo]" /> -- OR -- < %= file_field_tag "company[logo]" %> < %= form.submit %> < % end %> 
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